Ответы на вопрос:
Washing gum is a pretty old invention, existing in the case of each student. prototypes of the eraser on the basis of wet bread could be found among the ancient greeks and romans, but they had one major drawback - the bread eraser quickly covered with mold and crumble. rubber erasers appeared only in 1770, when the british clergyman joseph priestley discovered that rubber can erase traces of graphite. today washing gum is one of the most important items in the office.
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